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Environment

MEXICO

The monarch butterfly is back. Thirteen months ago, a winter storm in Mexico killed more than 200 million soon after the butterfly’s annual migration from the US and Canada. But a census of this year’s migrators at their Mexican wintering grounds shows that the population has largely recovered.

ITALY

Food irradiation may get the green light next month from international industry regulators. The Rome-based Codex Alimentarius Commission will consider raising or abolishing limits on absorbed radiation in food. Consumer unease over the use of radiation to kill pathogens peaked in the 1990s, but has since been eclipsed by concerns …